A COMPARISON OF DC AND PULSED FE-NI ALLOY DEPOSITS
A COMPARISON OF DC AND PULSED FE-NI ALLOY DEPOSITS
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DOI：
10.1149/1.2056238
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发表时间：
1993-04-01
影响因子：
3.9
通讯作者：
NOBE, K
中科院分区：
文献类型：
--
作者：
GRIMMETT, DL;SCHWARTZ, M;NOBE, K
采用直流电沉积技术、脉冲电沉积技术和脉冲反相电沉积技术研究了流体力学和温度对电沉积Fe-Ni合金的影响。结果表明，在高电流密度下，旋转圆柱形阴极上共沉积的铁具有很强的传质效应。目前沉积过程的许多特征与Hessami和Tobias模型一致。对单一金属和合金沉积的极化行为的比较清楚地表明，镍的共沉积速率较低，这与以前关于Fe-Ni合金异常共沉积的报道一致。X射线衍射研究表明，电沉积合金中的晶相(fcc、bcc和fcc+bcc混合相)取决于合金成分和沉积条件。未退火合金的电铸圆柱体的热膨胀系数为7.7-10.9×10(-6)/度-C，在680℃下退火的合金的热膨胀系数为4-5×10(-6)/度-C。随着Fe含量的增加，镀层的平均内应力增大。
The effect of hydrodynamics and temperature on the electrodeposition of Fe-Ni alloys has been investigated with dc, pulse, and pulse-reverse electrodeposition techniques. Strong mass-transfer effects in the co-deposition of Fe on rotating cylindrical cathodes were indicated at high current densities. Many features of the present deposition process are shown to be consistent with the Hessami and Tobias model. A comparison of the polarization behavior of single-metal and alloy deposition clearly demonstrate the lower rate of Ni co-deposition in accord with previous reports of anomalous co-deposition of Fe-Ni alloys. X-ray diffraction studies indicate that the crystalline phases (fcc, bcc, and mixed fcc + bcc) in the electrodeposited alloys depend on alloy composition and deposition conditions. Thermal expansion coefficients of electro-formed cylinders of near-Invar compositions ranged from 7.7-10.9 x 10(-6)/degrees-C for unannealed alloys to 4-5 x 10(-6)/degrees-C for alloys annealed at 680-degrees-C. Average internal stress of deposits increased with increasing Fe content.